Negative pressure filtering device

Abstract

The utility model relates to the technical field of separation, and discloses a negative pressure filtering device, which comprises a filtering barrel and a filtering medium plate, the inner wall of the filtering barrel is fixedly connected with a plurality of ultrasonic vibrators, the left side of the outer wall of the filtering barrel is fixedly connected with a cleaning fluid box, the rear side of the top of the cleaning fluid box is fixedly connected with a booster pump, and the booster pump is fixedly connected with the ultrasonic vibrators. A flexible cleaning pipe is fixedly connected to the top of the booster pump, two fixing plates are fixedly connected to the left side of the inner wall of the filtering barrel, a self-cleaning rotary spray head is fixedly connected to the right end of the flexible cleaning pipe, and a servo motor is fixedly connected to the bottom end of the filtering barrel. According to the cleaning device, cleaning liquid in the cleaning liquid box is extracted through the booster pump and is forcefully sprayed out through the self-cleaning rotary spray head to wash impurities on the top of the filter barrel, the servo motor drives the cleaning brush to rotate, the inner wall of the filter barrel is cleaned in all directions in cooperation with the electric push rod, cleaning dead corners are eliminated, and the cleaning effect is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of separation technology, and in particular to a negative pressure filtration device. Background Technology

[0002] Negative pressure filtration devices are solid-liquid separation equipment driven by pressure difference. The core of the device is to create a pressure gradient in the filtration chamber through a negative pressure device, driving the fluid through a porous filter medium, thereby achieving the operation of impurity interception and filtrate collection. The device includes a filtration chamber, filter medium, negative pressure source, and cleaning module. The selection of filter medium and the efficiency of the cleaning module directly determine the stability and service life of the equipment. With the increasing requirements for filtration accuracy in industrial scenarios, how to reduce maintenance costs while ensuring filtration efficiency has become a problem that negative pressure filtration devices need to solve.

[0003] Traditional negative pressure filtration devices use fixed filter screens, but their filtration efficiency is low. Backwashing structures and detachable filter cartridge designs use pressure sensors to monitor pressure difference changes in real time. When the pressure difference of the filter membrane reaches a threshold, backwashing is performed, effectively reducing the risk of filter media clogging. However, the cleaning fluid cannot reach the corners of the filtration chamber or the inside of the filter media, resulting in residual impurities inside the equipment after long-term use, affecting the filtration effect and equipment performance. The existing solution is to use online cleaning technology, which improves cleaning efficiency by cleaning without disassembling the equipment. Although online cleaning technology is convenient, it is not as thorough as offline disassembly cleaning for stubborn stains or long-term accumulated impurities. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a negative pressure filtration device, which aims to improve the problem that existing online cleaning technologies cannot thoroughly clean stubborn stains or long-term accumulated impurities.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a negative pressure filtration device, comprising a filter barrel and a filter media plate, wherein multiple ultrasonic transducers are fixedly connected to the inner wall of the filter barrel, a cleaning liquid tank is fixedly connected to the left side of the outer wall of the filter barrel, a booster pump is fixedly connected to the top rear side of the cleaning liquid tank, a flexible cleaning tube is fixedly connected to the top of the booster pump, two fixing plates are fixedly connected to the left side of the inner wall of the filter barrel, a self-cleaning rotating nozzle is fixedly connected to the right end of the flexible cleaning tube, a servo motor is fixedly connected to the bottom end of the filter barrel, a rotating shaft is fixedly connected to the output end of the servo motor, an electric push rod is fixedly connected to the top end of the rotating shaft, an adapter block is fixedly connected to the top end of the electric push rod, cleaning brushes are fixedly connected to both the left and right sides of the adapter block, a drain valve is provided at the bottom end of the filter barrel, a sealing cover is rotatably connected to the top end of the filter barrel, a heating component is provided at the front side of the cleaning liquid tank, and a slag discharge mechanism is provided on the right side of the filter barrel, the slag discharge mechanism being used to remove residual impurities inside the filter barrel.

[0006] As a further description of the above technical solution:

[0007] The slag discharge mechanism includes a first rotating motor, the top of which is fixedly connected to the bottom of the bottom fixed plate. A scraper is fixedly connected to the output end of the first rotating motor. A slag discharge pipe is fixedly connected to the right side of the filter barrel. A storage box is fixedly connected to the bottom end of the slag discharge pipe. A second rotating motor is fixedly connected to the right side of the slag discharge pipe. A spiral guide plate is fixedly connected to the output end of the second rotating motor. A fixed frame is fixedly connected to the left end of the inner wall of the slag discharge pipe.

[0008] As a further description of the above technical solution:

[0009] The heating assembly includes a heating box, the rear side of which is fixedly connected to the top front side of the cleaning fluid tank, and a circulation pump is fixedly connected to the bottom of the heating box.

[0010] As a further description of the above technical solution:

[0011] The outer side of the filter medium plate is provided with multiple threaded grooves, and the inner wall of each of the multiple threaded grooves is threaded with screws.

[0012] As a further description of the above technical solution:

[0013] A water level display panel is fixedly connected to the left side of the cleaning fluid tank, and multiple scale lines are provided on the left side of the water level display panel.

[0014] As a further description of the above technical solution:

[0015] An observation hole is provided on the front side of the filter barrel, and an observation window is provided on the inner wall of the observation hole.

[0016] As a further description of the above technical solution:

[0017] The front side of the sealing cover is fixedly connected to a locking lug, and the top of the front side of the filter barrel is fixedly connected to a locking buckle.

[0018] As a further description of the above technical solution:

[0019] A rubber pad is fixedly connected to the bottom end of the filter media plate, and the rubber pad adopts a ring design.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, a booster pump extracts the cleaning fluid from the cleaning fluid tank, and the cleaning fluid is sprayed out through the self-cleaning rotating nozzle under sufficient impact force to clean the impurities on the top of the filter barrel. Then, the servo motor is started to drive the cleaning brush to rotate, thereby cleaning the inner wall of the filter barrel. At the same time, the electric push rod ensures that the barrel wall of the filter barrel below the filter medium can be cleaned, which not only avoids the existence of cleaning dead corners, but also makes stubborn stains completely removed.

[0022] 2. In this utility model, the first rotating motor drives the scraper to scrape off the filter residue on the filter medium plate. Under the action of centrifugal force, the filter residue is thrown into the slag discharge pipe. Then, the second rotating motor is started so that the spiral guide plate can convey the filter residue at the left end of the slag discharge pipe, so that the filter residue finally falls into the collection box. In addition, the fixed frame can ensure that the spiral guide plate does not move left or right, thus ensuring the stability of the internal components of the device. Attached Figure Description

[0023] Figure 1 This is a perspective view of a negative pressure filtration device proposed in this utility model;

[0024] Figure 2 This is a side view of a negative pressure filtration device proposed in this utility model;

[0025] Figure 3 This is a cross-sectional view of the filter cylinder of a negative pressure filtration device proposed in this utility model;

[0026] Figure 4 This is a schematic diagram of the cleaning liquid tank of a negative pressure filtration device proposed in this utility model;

[0027] Figure 5 This is a cross-sectional view of the slag discharge pipe of a negative pressure filtration device proposed in this utility model.

[0028] Legend:

[0029] 1. Filter barrel; 2. Filter media plate; 3. Slag discharge mechanism; 301. Rotary motor one; 302. Scraper; 303. Slag discharge pipe; 304. Rotary motor two; 305. Spiral guide plate; 306. Fixing frame; 307. Storage box; 4. Ultrasonic vibrator; 5. Cleaning liquid tank; 6. Booster pump; 7. Flexible cleaning pipe; 8. Fixing plate; 9. Self-cleaning rotating nozzle; 10. Servo motor; 11. Rotating shaft; 12. Electric push rod; 13. Cleaning brush; 14. Adapter block; 15. Drain valve; 16. Heating box; 17. Circulation pump; 18. Sealing cover; 19. Rubber gasket; 20. Threaded groove; 21. Screw; 22. Water level display panel; 23. Scale pattern; 24. Observation hole; 25. Observation window; 26. Locking lug; 27. Locking buckle. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figure 2 , Figure 3 and Figure 4This utility model provides an embodiment of a negative pressure filtration device, comprising a filter barrel 1 and a filter media plate 2. Multiple ultrasonic transducers 4 are fixedly connected to the inner wall of the filter barrel 1. These transducers 4 remove impurities from the inner wall of the filter barrel 1, enhancing the cleaning effect. A cleaning liquid tank 5 is fixedly connected to the left side of the outer wall of the filter barrel 1. The cleaning liquid tank 5 stores the cleaning liquid. A booster pump 6 is fixedly connected to the top rear side of the cleaning liquid tank 5. The booster pump 6 extracts the cleaning liquid from the cleaning liquid tank 5 and pressurizes it, ensuring that the cleaning liquid sprayed from the self-cleaning rotating nozzle 9 has sufficient pressure to flush away impurities. A flexible cleaning tube 7 is fixedly connected to the top of the filter tank 1. The flexible cleaning tube 7 is used to transport the cleaning fluid. Two fixing plates 8 are fixedly connected to the left side of the inner wall of the filter tank 1. The upper fixing plate 8 is used to fix the flexible cleaning tube 7 and the self-cleaning rotating nozzle 9. The lower fixing plate 8 is used to fix the rotating motor 301. The right end of the flexible cleaning tube 7 is fixedly connected to the self-cleaning rotating nozzle 9. The self-cleaning rotating nozzle 9 can not only prevent the nozzle from being blocked, but also increase the cleaning range of the cleaning fluid. The bottom end of the filter tank 1 is fixedly connected to the servo motor 10. The servo motor 10 provides power for the rotation of the cleaning brush 13. The output end of the servo motor 10 is fixedly connected to the rotating shaft. 11. The rotating shaft 11 is used to connect the servo motor 10 and the electric push rod 12. The top end of the rotating shaft 11 is fixedly connected to the electric push rod 12, which enables the cleaning brush 13 to move up and down, increasing the cleaning range of the cleaning brush 13 and avoiding the generation of cleaning dead corners. The top end of the electric push rod 12 is fixedly connected to the adapter block 14, which is used to connect the electric push rod 12 and the cleaning brush 13. The left and right sides of the adapter block 14 are fixedly connected to the cleaning brush 13, which cleans the wall of the filter tank 1 below the filter medium. The bottom end of the filter tank 1 is provided with a drain valve 15, which is used to drain the filter tank 1. The impurities cleaned by the cleaning brush 13 and the cleaning solution after use are discharged from the filter bucket 1. The top of the filter bucket 1 is rotatably connected to a sealing cover 18, which can prevent external impurities from falling into the filter bucket 1. A heating component is provided on the front side of the cleaning solution tank 5. The heating component includes a heating box 16, which is used to heat the clean water. The rear side of the heating box 16 is fixedly connected to the top of the front side of the cleaning solution tank 5. A circulation pump 17 is fixedly connected to the bottom of the heating box 16, which is used to extract the cleaning solution in the cleaning solution tank 5. A slag discharge mechanism 3 is provided on the right side of the filter bucket 1, which is used to remove the impurities remaining in the filter bucket 1.

[0032] Specifically, when solid impurities are trapped above the filter media plate 2 or on the inner wall of the filter barrel 1 and need cleaning, the heating box 16 is activated to heat the cleaning solution. The heating temperature is set according to actual needs. When the cleaning solution reaches a suitable temperature, the circulation pump 17 is activated to extract and circulate the cleaning solution in the cleaning solution tank 5. The booster pump 6 is activated to extract and pressurize the cleaning solution in the cleaning solution tank 5, and deliver it to the self-cleaning rotary nozzle 9 through the flexible cleaning pipe 7. The self-cleaning rotary nozzle 9 sprays cleaning solution with sufficient pressure to rinse the inner wall of the filter barrel 1 and the attached impurities. Due to the rotation function of the self-cleaning rotary nozzle 9, the cleaning range of the cleaning solution is increased, and nozzle clogging is avoided. While the nozzle is cleaning, multiple ultrasonic transducers 4 are activated to generate ultrasonic vibrations, further removing impurities from the inner wall of the filter bucket 1 and enhancing the cleaning effect. The servo motor 10 is activated, and the servo motor 10 drives the electric push rod 12 to rotate via the rotating shaft 11. As needed, the electric push rod 12 is activated to extend or shorten, driving the adapter block 14 and the cleaning brush 13 to move up and down. The cleaning brush 13 cleans the wall of the filter bucket 1 below the filter media plate 2, further removing residual impurities. After cleaning, the drain valve 15 is opened to discharge the impurities cleaned by the cleaning brush 13 and the used cleaning liquid from the filter bucket 1, completing the cleaning and draining operation.

[0033] Reference Figure 1 , Figure 3 and Figure 5 The slag discharge mechanism 3 includes a rotating motor 301, which provides power for the rotation of the scraper 302. The top of the rotating motor 301 is fixedly connected to the bottom of the bottom fixing plate 8. The output end of the rotating motor 301 is fixedly connected to the scraper 302. The scraper 302 removes the filter residue from the surface of the filter media plate 2 and, under the action of centrifugal force, throws the filter residue into the slag discharge pipe 303. The slag discharge pipe 303 is fixedly connected to the right side of the filter barrel 1. The slag discharge pipe 303 is used to discharge the filter residue from the filter barrel 1. The bottom end of the slag discharge pipe 303 is fixedly connected to a collection box 307. Used to collect filter residue for subsequent unified processing, a rotating motor 304 is fixedly connected to the right side of the slag discharge pipe 303. The rotating motor 304 provides power for the rotation of the spiral guide plate 305. The output end of the rotating motor 304 is fixedly connected to the spiral guide plate 305. The spiral guide plate 305 is used to guide the filter residue falling into the slag discharge pipe 303 to move to the right. The surface of the spiral guide plate 305 is rounded so that the filter residue is not stuck to the surface of the spiral guide plate 305. A fixing frame 306 is fixedly connected to the left end of the inner wall of the slag discharge pipe 303. The fixing frame 306 is used to fix the spiral guide plate 305.

[0034] Specifically, when the filtration process in filter tank 1 is complete and sludge discharge is required, the first rotating motor 301 is started. After the first rotating motor 301 is powered on, it drives the scraper 302 to rotate. During rotation, the scraper 302 contacts the surface of the filter media plate 2, scraping off the filter sludge adhering to the surface. Due to the centrifugal force generated by the rotation of the scraper 302, the scraped filter sludge is thrown towards the sludge discharge pipe 303, thus leaving the surface of the filter media plate 2. The shape of the scraper 302 can be designed to make it easier to throw off the filter sludge. After the filter sludge enters the sludge discharge pipe 303, the second rotating motor 304 is started. The second part 304 drives the spiral guide plate 305 to rotate. The spiral structure of the spiral guide plate 305 generates a rightward thrust on the filter residue falling into the slag discharge pipe 303, guiding the filter residue to move to the right along the slag discharge pipe 303. Since the surface of the spiral guide plate 305 is smooth after rounding, the friction between the filter residue and the spiral guide plate 305 is reduced, making it difficult for the filter residue to adhere to the surface of the spiral guide plate 305. Under the guidance of the spiral guide plate 305, the filter residue continues to move to the right side of the slag discharge pipe 303 and finally falls into the collection box 307 connected to the bottom end of the slag discharge pipe 303. The collection box 307 is used to collect the filter residue for unified processing.

[0035] Reference Figure 1 , Figure 2 and Figure 3 The filter media plate 2 has multiple threaded grooves 20 on its outer side, and screws 21 are threaded onto the inner walls of each threaded groove 20. The filter media plate 2 is fixed to the inner wall of the filter tank 1 via the multiple threaded grooves 20 and screws 21. A water level display plate 22 is fixedly connected to the left side of the cleaning fluid tank 5. Multiple scale marks 23 are provided on the left side of the water level display plate 22. The water level display plate 22 is used to display the volume of cleaning fluid in the cleaning fluid tank 5 in real time. The multiple scale marks 23 facilitate the observation of the cleaning fluid volume by the staff. The filter tank 1... An observation hole 24 is provided on the front side, and an observation window 25 is provided on the inner wall of the observation hole 24. The inside of the filter barrel 1 can be observed through the observation hole 24 and the observation window 25. A locking lug 26 is fixedly connected to the front side of the sealing cover 18, and a latch 27 is fixedly connected to the top of the front side of the filter barrel 1. The locking lug 26 and the latch 27 are used to lock the sealing cover 18. A rubber pad 19 is fixedly connected to the bottom end of the filter medium plate 2. The rubber pad 19 can prevent the vibration of the ultrasonic transducer 4 from damaging the filter medium plate 2. The rubber pad 19 adopts a ring design.

[0036] Specifically, before the equipment is put into operation, staff can connect the equipment to a mobile device via wireless technology, enabling remote control of the device. During installation, the filter media plate 2 is placed in its predetermined position within the filter tank 1. Then, multiple screws 21 are screwed into the threaded grooves 20 and fixed to the inner wall of the filter tank 1, thus securing the filter media plate 2 and preventing loosening or displacement during filtration and cleaning. Before or during operation, staff can directly observe the water level display panel 22. By checking the scale markings 23 corresponding to the cleaning fluid level, staff can accurately determine the remaining capacity of the cleaning fluid in the cleaning fluid tank 5. The observation window 25 is made of transparent material, allowing for clear viewing. The internal condition of the filter barrel 1 is displayed. Based on the observation, the staff judges the operating status of the equipment. Before the filtration or cleaning work begins, the sealing cover 18 is placed on the top of the filter barrel 1. Then, the sealing cover 18 is firmly locked onto the filter barrel 1 by the engagement of the locking lug 26 and the locking buckle 27, preventing external impurities from entering the filter barrel 1. At the same time, it ensures the negative pressure environment inside the filter barrel 1 or the sealing of the cleaning process. Since the filter media plate 2 and the ultrasonic transducer 4 are installed inside the filter barrel 1, the vibration of the ultrasonic transducer 4 will be transmitted to the filter media plate 2. The rubber pad 19 can absorb and disperse the vibration energy transmitted by the ultrasonic transducer 4, avoiding damage to the filter media plate 2 due to vibration, thereby extending the service life of the filter media plate 2 and ensuring the normal operation of the equipment.

[0037] Working Principle: Based on actual needs, the heating box 16 is activated to heat the cleaning solution in the cleaning solution tank 5. Once the cleaning solution reaches the predetermined temperature, the circulation pump 17 draws the cleaning solution from the cleaning solution tank 5 and circulates it, ensuring the uniformity and stability of the cleaning solution temperature. The booster pump 6 draws out the cleaning solution from the cleaning solution tank 5 and pressurizes it. The pressurized cleaning solution is then transported to the self-cleaning rotary nozzle 9 through the flexible cleaning pipe 7. The self-cleaning rotary nozzle 9 sprays the cleaning solution with sufficient pressure, powerfully rinsing the inner wall of the filter tank 1 and the impurities adhering to it. Furthermore, the rotation function of the self-cleaning rotary nozzle 9 increases the cleaning area and effectively prevents the nozzle from being clogged by impurities, improving cleaning efficiency. In terms of efficiency, while the self-cleaning rotating nozzle 9 is rinsing, multiple ultrasonic transducers 4 generate ultrasonic vibrations. The ultrasonic waves generate tiny cavitation bubbles in the cleaning fluid. During the formation and collapse of the cavitation bubbles, strong pressure and impact force are generated, causing impurities to fall off the inner wall and enhancing the cleaning effect. The servo motor 10 drives the electric push rod 12 to rotate through the rotating shaft 11. At the same time, the electric push rod 12 extends or shortens as needed, driving the adapter block 14 and cleaning brush 13 to move up and down. The cleaning brush 13 can directly mechanically scrub the wall of the filter barrel 1 located below the filter media plate 2, further removing impurities remaining at the bottom of the barrel wall, making up for the cleaning dead angle problem that exists by simply relying on fluid cleaning, and ensuring the comprehensive cleaning of the inside of the filter barrel 1.

[0038] Furthermore, after the filtration process in filter tank 1 is completed, the rotating motor 301 is started. The rotating motor 301 drives the scraper 302 to rotate around its fixed axis. The scraper 302 contacts the surface of the filter media plate 2. Utilizing the friction between itself and the filter residue, as well as the mechanical scraping action of the scraper 302, the filter residue adhering to the surface of the filter media plate 2 is scraped off. As the scraper 302 rotates at high speed, the filter residue on the scraper 302 is subjected to centrifugal force, causing the filter residue to be thrown out along the tangential direction of the scraper 302's rotation, moving towards the slag discharge pipe 303, thereby achieving the separation of the filter residue from the filter media plate 2. Meanwhile, the scraper 302... The shape of 02 is designed to further optimize the effect of centrifugal force, allowing the filter residue to be thrown away more smoothly. The rotating motor 304 drives the spiral guide plate 305 to rotate. The spiral structure of the spiral guide plate 305 generates a thrust along the spiral direction on the filter residue falling into the slag discharge pipe 303, which can make the filter residue move to the right along the slag discharge pipe 303. At the same time, since the surface of the spiral guide plate 305 is smoothed, the friction between the filter residue and the spiral guide plate 305 is reduced, allowing the filter residue to be transported more smoothly. The storage box 307 provides a space for centralized storage of filter residue, which facilitates the unified processing of the filter residue in the future.

[0039] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A negative pressure filtration device, comprising a filter barrel (1) and a filter media plate (2), characterized in that: Multiple ultrasonic transducers (4) are fixedly connected to the inner wall of the filter barrel (1). A cleaning liquid tank (5) is fixedly connected to the left side of the outer wall of the filter barrel (1). A booster pump (6) is fixedly connected to the top rear side of the cleaning liquid tank (5). A flexible cleaning tube (7) is fixedly connected to the top of the booster pump (6). Two fixing plates (8) are fixedly connected to the left side of the inner wall of the filter barrel (1). A self-cleaning rotating nozzle (9) is fixedly connected to the right end of the flexible cleaning tube (7). A servo motor (10) is fixedly connected to the bottom end of the filter barrel (1). The output end of the servo motor (10) is fixedly connected to... There is a rotating shaft (11), and an electric push rod (12) is fixedly connected to the top end of the rotating shaft (11). An adapter block (14) is fixedly connected to the top end of the electric push rod (12). Cleaning brushes (13) are fixedly connected to both the left and right sides of the adapter block (14). A drain valve (15) is provided at the bottom end of the filter bucket (1). A sealing cover (18) is rotatably connected to the top end of the filter bucket (1). A heating component is provided on the front side of the cleaning liquid tank (5). A slag discharge mechanism (3) is provided on the right side of the filter bucket (1). The slag discharge mechanism (3) is used to remove the impurities remaining in the filter bucket (1).

2. The negative pressure filtration device according to claim 1, characterized in that: The slag discharge mechanism (3) includes a first rotating motor (301), the top of which is fixedly connected to the bottom of the bottom fixing plate (8), the output end of which is fixedly connected to a scraper (302), the right side of the filter barrel (1) is fixedly connected to a slag discharge pipe (303), the bottom end of which is fixedly connected to a storage box (307), the right side of which is fixedly connected to a second rotating motor (304), the output end of which is fixedly connected to a spiral guide plate (305), and the left end of the inner wall of the slag discharge pipe (303) is fixedly connected to a fixing frame (306).

3. The negative pressure filtration device according to claim 1, characterized in that: The heating assembly includes a heating box (16), the rear side of which is fixedly connected to the top front side of the cleaning fluid tank (5), and a circulation pump (17) is fixedly connected to the bottom of the heating box (16).

4. The negative pressure filtration device according to claim 1, characterized in that: The filter medium plate (2) has multiple threaded grooves (20) on its outer side, and screws (21) are threadedly connected to the inner walls of the multiple threaded grooves (20).

5. A negative pressure filtration device according to claim 1, characterized in that: A water level display panel (22) is fixedly connected to the left side of the cleaning fluid tank (5), and multiple scale lines (23) are opened on the left side of the water level display panel (22).

6. The negative pressure filtration device according to claim 1, characterized in that: An observation hole (24) is provided on the front side of the filter barrel (1), and an observation window (25) is provided on the inner wall of the observation hole (24).

7. A negative pressure filtration device according to claim 1, characterized in that: The front side of the sealing cover (18) is fixedly connected with a locking lug (26), and the front top of the filter bucket (1) is fixedly connected with a buckle (27).

8. A negative pressure filtration device according to claim 1, characterized in that: A rubber pad (19) is fixedly connected to the bottom end of the filter media plate (2), and the rubber pad (19) adopts a ring design.

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